ah! ... short grain is prefered because they want to get a crispier more alcoholy taste. its because when its short grain, most of the grain is made up of the sperm of the grain(whatever its called its the part of the grain that will transform in plant if it sprout) and very little reserve of enegy starch
i want it to be sweet and tasty im not so much after very crisp alcopholy taste so thats why i choose it. the yield will also be alot better quantity and alcohol % wise
a shrt grain will give you 16% max with long grain you will reach more than 20% and you will still have alot of residual swetness and tons of cherry flavor. short grain will give you a clearer wine, long grain more of a yellow wine
if you are to use short grain do not go for super expensive sushi rice or whatever, some calrose rice that you can get in 20lbs bag will give you THE EXACT SAME RESULT as the its the structure of the grain that matter...calrose short grain dont carry more reserve starch in its grain than a pricey short grain rice
whoever tell you that his hyper expensive (insert unpronouncable japanese name here) rice give way better wine is just a lier buying all the folklore. polishing the rice is also just a way to take away some starch to only ferment the endosperm middle...with polished rice you may go down to 13% alcohol but it will be almost totally clear and taste like a kind of vodka